Experiment: Nguyen Group_20201224_2-methylbut-3-ene-1,2-diol/10028-14-5/hydrogen peroxide_Hydroxyl radical_No Seed


Name: Nguyen Group_20201224_2-methylbut-3-ene-1,2-diol/10028-14-5/hydrogen peroxide_Hydroxyl radical_No Seed
Date: 2020-12-24

Nguyen Group

Tran's big bag of air

Experiment Set
1,2-dihydroxy isoprene (DHI)

Investigate 1,2-DHI + OH oxidation products under high-NOx conditions

1,2-DHI, NO, and H2O2 were injected and photooxidation was initiated by turning the UV lights on. CIMS appeared to be a little leaky, the pressure wasn't quite stable.

Experiment Details


  • Gas phase chemical reaction
Temperature: 22
Relative Humidity: 5
Seeded Experiment: No
Fuchs Adjusted Surface Area:
Condensation sink rate coefficient: 5
Reaction type:
Oxidant Name: Hydroxyl radical
Initial Oxidant Concentration Value: 3e6 (molecules_per_cubic_centimeter)
RO2 Main Fate: NO
RO2 Lifetime: (Seconds)
Pressure: 755 Torr

Data Set plots
Choose a file: Choose the X-Axis:

Experiment Set Details

Name: 1,2-dihydroxy isoprene (DHI)
Time format and units: HH:MM, local time
A series of experiments to investigate the gas-phase oxidation rate of 1,2-dihydroxy isoprene, its oxidation products via various RO2 pathways, and the effects of including seed (AS = ammonium sulfate) particles both on observed gas-phase products and on SOA formation.


  • Kelvin H Bates Harvard / UC Davis


Principal investigator:

Tran B. Nguyen
Phone: 5307525987
E-mail: tbn@ucdavis.edu
OrcID: 0000-0001-9206-4359

Data Manager:

Kelvin H. Bates
E-mail: kelvinhbates@gmail.com


Reactant Compound type Concentration Concentration units
2-methylbut-3-ene-1,2-diol (185554)
  • Alcohol
  • Alkene
  • Diol
50 Parts Per Billion
10028-14-5 (24822)
  • NOx
200 Parts Per Billion
hydrogen peroxide (784) 2 Parts Per Million

timeline_201224.csv Timeline

Time_local_HHMM Action
10:19 CIMS on
10:30 Begin simultaneous injection of H2O2 (65 uL 50% in H2O) & DHI (6.5 uL) with 4 slm air
10:35 SMPS on
11:10 Stop H2O2 / diol injection
11:12 Inject NO bulb and pulse mixing air
11:15 All injections stop
12:20 100% lights on
13:03 Lights off
13:28 Switch CIMS to MSMS sampling
14:08 100% lights on
14:55 Lights off
15:45 Instruments off

Light Flux Characterizations:
Particle Loss Characterizations:
Vapor Loss Characterizations:

Chamber Details

Name: Tran's big bag of air
Volume in cubic meters: 10
Shape: Rectangular Prism
Surface area in cubic meters: 28
Flow Mode: Batch
Flow through rate in liters per minute:
Body Material: Teflon
Body thickness: 2
Replacement date:
Replacement frequency: As needed
Cleaning method: Flushing with air Flushing with air with UV lights on Oxidation
o3 background: < 0.5 ppb
nox background:
Particle background in micrograms per cubic meter:
Air filtration method: Custom filtration canisters to remove NOx, hydrocarbons, water, particles, ozone, SOx from pressurized ambient air.
Mixing method: 1
Mixing method material: Pulsed air jets, manually actuated
Temparature Control: Yes
Temparature measurements recorded: Yes
Temparature range (min degrees celcius):
Temparature range (max degrees celcius):
Humidity Control: Yes
Humidity Measurements Recorded: Yes
Relative humidity range (min percent):
Relative humidity range (max percent):
Particle experiment capability: 1
Lights: Yes
Light source type(s): UV broadband black lights (centered at 350 nm)
Supplemental information:
Additional Notes: 40-Watt, Osram/Sylvania 350nm black lights, 48” long, T12 fluorescent; 72 bulbs, 36 each on two facing walls, with UV-reflective siding on all walls. Lights are controlled via 6 panels (3 on the right wall - top, mid, bottom - and 3 equivalent on the left wall).